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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS
International General Certificate of Secondary Education
*8857711150*
DESIGN AND TECHNOLOGY
0445/04
Paper 4 Systems and Control
October/November 2007
1 hour
Candidates answer on the Question Paper.
No Additional Materials are required.
To be taken together with Paper 1 in one session of 2 hours 15 minutes.
READ THESE INSTRUCTIONS FIRST
Write your Centre number, candidate number and name on all the work you hand in.
Write in dark blue or black pen.
You may use a soft pencil for any diagrams or graphs.
Do not use staples, paper clips, highlighters, glue or correction fluid.
DO NOT WRITE IN ANY BARCODES.
Section A
Answer all questions.
Section B
Answer one question.
You may use a calculator.
At the end of the examination, fasten all your work securely together.
The number of marks is given in brackets [ ] at the end of each question or part question.
For Examiner's Use
Section A
Section B
Total
This document consists of 14 printed pages and 2 blank pages.
IB07 11_0445_04/2RP
© UCLES 2007
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For
Examiner's
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Section A
Answer all questions in this section.
1
Complete the statement below:
A tie is a structural member experiencing
2
force.
[1]
Identify the electrical component shown below.
16 V
+
symbol
component
3
The component shown is
[2]
Give one use of this component.
[1]
Complete the table below.
Name
Diagram
Use
Pear cam and flat follower
Valve operation
Bicycle transmission
[3]
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4
For
Examiner's
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Identify the class (order) of lever shown below:
effort
load
fulcrum
The lever shown is
[1]
Give an example of the use of this class of lever.
[1]
5
The diagram below shows a linkage.
input motion
fixed pivot
(a) Add labels to show the direction of the output motion.
[2]
(b) Name the type of motion shown in the diagram of the linkage above.
[1]
(c) Explain the function of this linkage.
[2]
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For
Examiner's
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Complete the table below.
Name
Diagram
Use
Honeycomb cells
[1]
[1]
[1]
‘I’ Section beam
Steel framed buildings
[2]
7
Identify the logic gate shown in the diagram below.
[1]
8
(a) State the purpose of an LDR transducer.
[1]
(b) Give one example of the use of an LDR.
[1]
9
Give one example of the use of a strain gauge.
[1]
10 Name two methods of reinforcing a square framed structure.
[2]
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For
Examiner's
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Section B
Answer one question from this section.
11 Fig.1 shows a hand drill.
cranked handle
driven gears
driver gear
drill chuck
Fig. 1
(a) Describe the motion conversion that takes place when using a hand drill.
[2]
(b) (i) Name the type of gear mechanism used in the hand drill shown.
[1]
(ii) Explain why the driver gear wheel is very much larger than the driven gear wheels.
[2]
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(iii) Give one reason for the top driven gear wheel nearest the handle.
[2]
(c) Explain why the handle is cranked.
[3]
(d) The driver wheel has 60 teeth and the driven wheels have 12 teeth each.
(i) Calculate the gear ratio for this mechanism.
[3]
(ii) If the driver wheel is turned at 60 rpm, calculate the speed of the drill chuck.
[3]
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(e) Fig. 2 shows a toothed belt drive arrangement.
pulley B
pulley A
drive belt
Fig. 2
(i) Give one benefit of using this type of belt drive.
[1]
(ii) Explain one drawback of using this type of belt drive.
[2]
(iii) Give one example of the use of this type of belt drive.
[1]
(iv) Explain how you would calculate the Velocity Ratio of this belt drive.
[3]
(f) Give one other type of pulley drive belt and give one use.
[2]
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For
Examiner's
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12 Fig.3 shows a variety of both natural and man made structures.
Fig. 3
(a) (i) Name one frame structure in Fig.3.
[1]
(ii) Name one man made shell structure in Fig.3.
[1]
(b) Explain the difference in the way in which frame and shell structures work.
[2]
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(c) Explain the following functions of a structure.
Support:
[2]
Span:
[2]
Contain:
[2]
(d) Structures can be subjected to static and dynamic forces.
Explain, using examples, the difference between static and dynamic forces.
[3]
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Examiner's
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(e) Fig. 4 shows a structure for a roof truss.
4
3
1
2
Fig. 4
(i) Name the parts numbered 1 to 3.
1
[1]
2
[1]
3
[1]
(ii) Part 4 is a strut.
Use sketches and notes to explain the type of load experienced by a strut.
[2]
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Examiner's
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(iii) Use sketches and notes to explain why the roof truss is made up of triangles.
[2]
(iv) Draw one method of reinforcing the joints in the roof truss.
[2]
(f) Use notes and sketches to explain the term redundant member.
[3]
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13 Fig. 5 shows a counting circuit triggered by a photoswitch.
D
C
+9 V
+
E
47 kΩ
100 Ω
6V
0.06 A
10 kΩ
–2
7
2.2 kΩ
741
2.7 kΩ
+3
2N3703
or
2N3702
1234
4
F
10 kΩ
–
A
0V
24 V
B
Fig. 5
(a) Complete the block diagram to explain how this counting circuit works each time the
light beam, shining on component A, is broken.
lightbulb
[4]
(b) (i) Name component B.
[1]
(ii) Explain the purpose of component B in this circuit.
[3]
(iii) Explain the need for component F.
[2]
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(iv) Explain the purpose of component C.
[3]
(v) State the purpose of the resistor E.
[1]
(c) The pair of 10 kΩ resistors labelled D are known as a potential divider.
Explain the term potential divider.
[3]
(d) Explain how the circuit shown in Fig. 5 could be simply modified to count when the light
beam is shining on component A.
[3]
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(e) Logic gates could be used to control a counter. Fig. 6 shows a pressure pad circuit that
is used to trigger a counter when a person steps on pad P and, at the same time,
presses the push button Q.
P
Q
counter
Fig. 6
(i) Complete the truth table below for this logic circuit.
Pad P
On/Off
Pad Q On/Off
Counter state On/Off
Off
Off
Off
Off
On
On
Off
On
[4]
(ii) Identify the type of logic circuit shown.
[1]
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0445/04/O/N/07
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reasonable effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the
publisher will be pleased to make amends at the earliest possible opportunity.
University of Cambridge International Examinations is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of University of
Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge.
0445/04/O/N/07